In the exclusive clip above, Mac uses a sharp blade and a steady hand to ascertain that a cell phone-activated bomb has been neutered. Yet in doing so, he unwraps an equally nasty problem, one that will require some MacGyverian know-how to solve.

Later in the episode, titled “Wrench,” Mac must use only the titular tool and some rope to defuse yet another bomb, set near the United Nations by “The Ghost” (Sons of Anarchy‘s Niko Nicotera), an old nemesis whose work killed his mentor.